the percentage ratio of the number of foreign workers and employees to Russian ones, both in the total sum and within the limits of individual categories, is established by agreement of the parties at the conclusion of each concession contract individually...

10) The concessionaire may be granted the right, by agreement with the governmental organs of the RSFSR, to invite highly qualified specialists from among Russian citizens; the conditions of employment in each individual case must be coordinated with the organs of central authority.

[11) In contracts with concessionaires, there should be included each time an indication that the period of employment, as well as any other conditions relating to labor force, are coordinated with the corresponding trade union.]